Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 458 (BODY CONTROL SYSTEM)
1999 GMC Forward Control 5.7 R, Automatic
Section 458 (Body Control System)
1999 GMC Forward Control 5.7 R, AutomaticSECTION Section 458 (Body Control System)
WARNING: This page is about a different car, the 2003 Pontiac Aztek and 2003 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
- Schematic & Routing Diagrams
- Component Locator
- Diagnostic Information & Procedures
- Diagnostic Starting Point - Body Control System
- Scan Tool Data Definitions
- DTC B0008: Short To Battery In The Park Neutral Position Circuit
- DTC B1000: Internal Write Malfunction
- DTC B1004: KAM In The Module Has Been Reset
- DTC B1007: EEPROM Error
- DTC B1009: EEPROM Error
- DTC B1440: Monitored Ignition Switch Circuit Malfunction
- DTC B1507 or B1508: Load Control Circuit Does Not React As Commanded
- DTC C0550: Internal Write Malfunction
- Power Mode Mismatch
- Repair Instructions
- Description & Operation
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.